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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9aaf6b11cb84fff649bf1dfa8b21b7c553050ff69d4f4d311c3cf39883e863c' 
  AND token = 'zg6zGytQ8W0gPVsU+fOCB7ZYhSyFc8/zKN66ypZ9UTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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