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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f13c1d96605f04bd60c9e7113bb862902a4955c2ad3f3442d563ab5712230d5' 
  AND token = 'xHfhn3qLXEaMA7NlUPFHq0FwJpR0rPdO1cwQLWFSfMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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