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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c40c6952e7ee948c7c216d41b20220f20d41bcc9ab9ecc479e85a16ac3db8911' 
  AND token = '3Z8PUOxcEjQb+WKWwOwYCt1gFHS/tphww2DkXiQuIjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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