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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e496c76afe33741c5ed0e5cad7c36a00d9b5b1ed7dc3a5452bbb599d628fe323' 
  AND token = 't8S1eAGBQ854Ag13cuq6+74utVUhli+4Jkd/ltmwKrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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