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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c97949f0083add179db4fe1093316a5a8b9ebd536f238905329a433eefd907c7' 
  AND token = '+OCu9Fcc5X3p7vk89fG4GpwbTD5Fp3swR5pSvGcy8Wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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