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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '311e6ce88c8838843f63d0de955f63bade68af12e61e7b315956cf4f31367560' 
  AND token = 'PU+ONotgNjjlOky3EtoScNbIfxCFDivdXVm9ZkkTUtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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