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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a07b7c16a0e7cbedb4fccf706461c350f58fa7e209529dab14f6dcc6a750e782' 
  AND token = '7AJPtVIGaXO9+HDr/kP30IseV0sQCGxieqLYkMETG3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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