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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a82e211d5d60524dd6ad07cde148e54d8f521e3ac31d535a7e1f4c263b656a90' 
  AND token = 'oBudENgwRqpz0G5ok0skzMUeyd6CHjq9m6EhjVjBXIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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