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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '898458e2884cc6c577a90c148772d8bd785246835ffa0a0999a82f712d1493cd' 
  AND token = 'NZt0C5ttKXOn/+DZYJfAuwdPxYbn8q1ZH1N/anZQqHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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