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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c448d52ee4bb7d9bbef4d119f3e7f0b9a49b938b2ced1e723fc067317473d7c7' 
  AND token = 'J6bFrVxufN16rVvh5q17RU7oG/+TERhhK+N+5A51Xyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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