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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4988efdf1a5d04946098310a7b6869b4ee68bebad441675d158eea8af71453a4' 
  AND token = 'Qp8ywNjiw63nwR6zaNk0TEVHL/fqXSNMq+1HOLSL/8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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