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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '083f35d7fdddea8a5bbb8463a5abe2205736e7325e8b562b6c50359a55e405e4' 
  AND token = '6BlAadPbCiEwsmBuw1CSO6eaisB1aAYfiYkqdL1WDwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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