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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c147b6eb09fe2fd11055d99715a8de214946c0956ab5917c92186527681ec79' 
  AND token = 'XJDKaWQoqdxkPaaUu5ajS1ux1QGrI4+djOUPS5K/FMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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