SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d53c44bfbb9082ab2901160b3f38cdc14961d6e0ddb036aac6f4ebf421ab287' 
  AND token = '7kqWf+ki5uqxqytCNS/b9mgGrklYfjrhpJtwG5BALhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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