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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd9a48281f1c79d883af159e6b5e61549d587a4d37f5c58f7e5d9ebf93ad60e1' 
  AND token = 'IdaaI/6L3AZTiUMx3BL4T1vLmRX/+E+8xqkt9BS4D4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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