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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65ce58e8e3155c6bd2e259f54273a6063b735e3fba81bc80d9bb83f98584a0c7' 
  AND token = 'ytLW8NH6xHJZ41Qj2dste486MWZGmvHKnum05F/G6NM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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