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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3999736fb17f0c16eb86f851301b23b969d7b9e516fdc45b60d1c2dc317f2d7d' 
  AND token = '5tUAUce/RNFGTUDXNfW/6IZtSQAVeqopFbI2jwYsoD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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