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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baaf1e8b3b96497c7754a958d323fee086f5ac670c5c7202a64f0a67ba40adef' 
  AND token = 'G1SFJlnrhnfWVhRZeFGyS96RrQlN/NNHRb5bI+D2txs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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