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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a177ab2059c9f56163bf546bd28b3974bbbda9094c65a6981cfb0fef7c0dd751' 
  AND token = 'fgUEI5oGJJdOyWOl275ePyxOjI2+lh07U+Gc9sRxm8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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