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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8eb61ef37e45ebb3a2fb6789cb6bedea3658f4a3edc31e138715b6ae8a683a5b' 
  AND token = '3mUNtiYqxT79mCuelgFw7biWc+MglJ07z/vDQDbYg50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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