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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dd0dc2034301c0c805bef5ac17d91cbaac066419cd8d6da5f62f56e3d28135d' 
  AND token = '7V28e+ubAiOLOXAGdFXuOLkFJTga5cNakycDIZKFZW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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