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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f55584f5705dcfb265eb0fb848a1b53bc295a1a0d95d7efb5fc1457e3afbf350' 
  AND token = 'uYwpTx7/DjF5+7u7SE8cP6ZzcyD/usX26oIu7XPXfTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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