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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9642f950066db263c7ba71383d87e251aa200452c0d2386ffb99b5dc79248e2' 
  AND token = 'LlGcxD5iUyuQgFIzjMdRkQHkur4tNEmKX9NZH3ylcLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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