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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1aa26cd8b68e0603822c61cd65c6439a39e1692b32927c6eadb6935cdfe97983' 
  AND token = '86mykJ3Kbx9ypS3G9PH3b7ga7hAzDe9THbTe842EanU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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