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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90cac50a804b09c31792688e1aeb7ad06a176112190ee692149c85d257831568' 
  AND token = '/gfB7duDpQnBVbj0tKojTGGL3a57+a+EwJQMNGSJR98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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