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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b950e0dcd081b3b747c8b02adeadd5897eb8a35a8229347fdda18402ab47b30' 
  AND token = 'oavjds3wWnYnY6tz0bhWw1/8M9exXRnHjOLGvZoz08g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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