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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24d71ca8d3ab3f1893e9f689987415df7e812957d69e6acfb293fb2a1c823c69' 
  AND token = 'YJwzYX28enxpaJI3L5m7MBuRm7kjAuavydM/l1nvQnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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