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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa39a9f0b56b63a9a72cb7d14efa5231ac79f3b4f6fb51c7cf9dcb1b835bd2ff' 
  AND token = 'VMesY/9e4OEWF3fXq+8/odMfnfKzFGuOj2yU/Gcje4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}