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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25fb96b4b4ef50f72158290e76992f690ec4c9dcd80016ac8808b2f83c36fd50' 
  AND token = '1r31aD1TWQMoY5nigIzdmSDy99b0fFf2J71/uWtNzvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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