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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b86d2dc4f070233d802f01f0c17c27d9f4b0374c2e15055feb93f3593c349db' 
  AND token = '/791Ddjjy6WNNl1RPl0pPcQ4y6pNwGPrRV4/F+K8naE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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