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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b16f35a86f1f9212a1551898cbd63de043a736086ceab1758f11feda07ef4e8a' 
  AND token = 'SsIwXDWK7U1tO6fkkRZF0QRHXQEW4Sb9Zuf6eIq9RyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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