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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fadc91d0fa12ea227e444182f4964a1b5a8924fde8a0def53670303bfd28ded' 
  AND token = '13pKGc1CkFimhdmrvx4MGCfZYOWxJN9ZBvkojW2Bo4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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