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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4381f3383bfbd91acf54d4e59a4b59fbb6635ae19de4220d0ae1ffdea24e74ed' 
  AND token = 'ze/LonRIQ6rObnkdoP7GefrDyzW4Na7LFqSg9hpj9aM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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