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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b9ae5e8f64df2ef1d7af5ee45c6e946395dd9c8de8e301c7f8e523b849381c7' 
  AND token = 'I/ziK0lszkV4Ean/86zKzeUyk0OrlEIIQRHzpsJz8n8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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