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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3929aba9c0afe972c91222221b28f449733745e3fd89e59bceacf7838295af6' 
  AND token = 'xMcHI6+QCqTeZfVdJmQYJ6TgG3taKTcCz6i4Dc7NP7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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