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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06a1f5c5b63a4eff613bc6975d2dafcb2aed5568c73faa8cb49f5a73dbb23ab9' 
  AND token = 'lSzt4EEMJZt8KF9Y5VmzCmBHgEleXFAPxmTOMrCy9sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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