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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '509353d159dd75465876368e236469217832a11ee02a5e833fee819519dc8c14' 
  AND token = 'dzJkyVLBpWggpmH0vYLAUBOC0vnnVYMNCK0ltvDt0us=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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