SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9065184f6fa20aeb5dc2d75118751984ea8f62b990aba12ad38731d95ecee2d' 
  AND token = 'Z9IqkpOWjf/A+zbOJWPR1umCdh75eVRvI0UOQPYo4pI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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