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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0318fa4053ed7b2d5e6f95ef62c5f9e566ed6f9f8804eaf8119dc7418ac91294' 
  AND token = 'RZn2HlwlMWMMZTAEVcYV5NS/gg+b+0Fj8O7Y+af5SNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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