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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c71cea1a7f2bf310620ec62300b6cfc84b9d4b6c50deb2d9685f79a7c93734f' 
  AND token = 'gB9RGcqyS9KosO9HZByaKCT/vdTkDe/XcUEvG95ryn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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