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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4cd64756437715525ef4522f307cf0b59a4eed72896b205a903f1d178a6d106' 
  AND token = 'eP4g+65zpLeH3kg0SwtNDQP6dRfo0tlbvKUFABZblYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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