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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f26a084453bb6190edd343c8355c4787d91eb1242eded40abec7d6988a9e8440' 
  AND token = 'wmgN5z8epBeaasWBL9Jld0/NeY/Do/YzReHesNeVHjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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