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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afdd00bbe384ced0d83e1816ae3bb802edae8530f52313b4c087ecd13f384d9c' 
  AND token = '3+Fdm3IEHg6UWaQyC/T7i44IF4luIbks81yOfk+QmGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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