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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1faf7de728024a26e8cb69f76b8c64b86ebac36f10d7e7501c0601b9d5438661' 
  AND token = 'vH3qQB7t78HRzBOdEI2aaO37x7coPrn9yDaVHf/DHt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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