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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6bad86087cdc19f2f23904f8b6dc07fa086f09e3387a5d9cabd719e1c6fe5e8' 
  AND token = 'gA6flbnIb3zAjzpgFnvcKXVzKhZBfnWikIsYBirvBQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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