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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '713e0a9e9336f046dbf6e0ceb9c6ab9ffc557c4ae5bc7984bb63407ef1e72720' 
  AND token = 'VBrfW/b367BM3+zzNquQ+eWEr1mXSP69IqzOF1JOPpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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