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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6fb410aca319bc3d08f09cdb6352c127cca9b728dacdcee3658a15619eb46d9' 
  AND token = 'Q4pvqwaGdmsU+B8v0RkUuBMTQ+0d3dcx19FBcI5kh9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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