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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faa2dc38b8fc96d01dd48ae44f0f8a299ff9fb2a127413ebcb097d4fb7eb7c3c' 
  AND token = 'rU+HXRFODdML0qd2kpdiX9NbqrADZnDfYvidvs+SOW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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