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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '134690ceb8a4f9a7e76be2719e21fd17111bce9a75e40d10482eae47e03b41bd' 
  AND token = 'y9ywS7zDDFcB3P5d2KcI8YtlVOhCg8wSgvyTDKETfFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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