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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4baf99bf61ea60e98b80ea58de8b3f43b5fa9e9d84bbd569f95f2bf969f108b7' 
  AND token = 'GNlpslg3jUBgIU9I9ytnmNE4bdBjYzVU4yULkKwFAwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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