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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03341a7bb41590edb63eb8ffb298d95ab0d8d3532e0a4525d79585a9c857d382' 
  AND token = 'LtrJgHgWEzWjnaoGPADGbe9/ncVsDVaLAAATmAxwD7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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