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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '371689ff09e559e2e52a9c547a7840aa0255b656ee81e137ae6fec811f0f77be' 
  AND token = 'DjUZ7vNf/h1fJmH94mw9RSR2QQth17Xc+E5QjXtW4e8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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