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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6a1ab15962155292690968c9e18cd9a2751fb70136300073b7bf58cda9a9159' 
  AND token = 'mn4M9QTFa3PxSv3lKwxubsXKMfLT8Xj1FFOVD6LItZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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