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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fb7aba7b0fab78176f18db931745903a280dced3f3b2c95375c71a516b56e7d' 
  AND token = 'qCGW+COA9C1qSErVZsXBpsnQVDMZtGSrnX5q9yOEUC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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