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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa687c6c62c1077fe5013201a7e9cd92cbd1ac489eefa65f531813923b708cb5' 
  AND token = 'WqJnTQzC/tNRNVOJhRiW3vy01MYSpyfl8nr8bJJI0KU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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