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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bc603e6bc5100690e1eaefc37acd198d74ea4e25f4082327fa571ea9ce4b4e5' 
  AND token = 'Vp340qG1s/6uYo0maxe9Y7Wf2GmepjKzag6GW2tdwt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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