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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '868323c28ad71f9d67c01678b73d16e3125a1c3c0b00bcbd07762b1d813e705d' 
  AND token = 'WuQ3YyuIVQ92sSCP8IWCN69AVKNDM+i1xA7l6KzQ5/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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