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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c20296be2299b623e7b3df1e16b7a468d678be5671af584a56df46b16a542695' 
  AND token = 'RJDMck7KZ/8DZT8p7yYvWhFiXDReYcTaLHbFb/r+Lwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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