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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4536d541d3965d7beb18926b2f04cf885ce9506c24909895d7ed6100db93b64b' 
  AND token = 'i7cHVix1EwM+OPZAohKDENYxYa71TkyzcsFBN0BnORE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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