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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8102ebf1ad4ae395c84e64ba8d28f9f09545cd7ae460ac33ea03b3250d97948b' 
  AND token = 'dossKArg5kphpeJHIZh3jyPe1OuyG7mAS4tGMcfkZC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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