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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6fafdaddfa413ba7a8ecfd8c81e3c6433fe58d525a4904f670e3ec17e8621e3' 
  AND token = '/+rakxoiKJkjZrEx9aXewaJaZ5cKox3SK77yPiEiKzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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