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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3aee650913e57b896c043d7b0080b41ae46978a55b806eef6c5438ef3810958' 
  AND token = 'yATglubKGr3tEOuEMFxR+sXWRz2tIt/voA9PSyFv/7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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