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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9ca917385b66bef715dfd6c38fdcc04b9d7d1f218fe4f052f4f606a840e4cde' 
  AND token = 'plKYLoFymfKjEX824sEz07A1vTDGv3T56/WS+Fqz8jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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