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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd711f65bd564184d7d7ec2201ecd98a2f80741edbfe3eb4b2c5a924ed63ed820' 
  AND token = 'kptiKkM7x0U1bgL7+/3UDm3BfZGdCfOTeeTmJAguZk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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