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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '123c799871277c15ece32ac4daabad084c992c9a87b746de8fbf1045c528608d' 
  AND token = '9g1LUvuyZGZO4RDXgRYvj8cN9xu/+UL0xR73wfib0bE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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