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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b9b984c7ec49a1d187616b838063ef184fa26b3bcd4593854c77653dd2da44d' 
  AND token = 'MId3J+ENGHu7VEaXOZPGVHr8+FPwS69pdPgKomqk8uM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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