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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '489d6034dfce0ce03e1763ce554360265692836da313f20d5679499d5bb7d027' 
  AND token = '5V+Ef0FEcUNFyFaqFBrTqo5QWxgBuz5rGr5mznFBTtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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