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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f80b236dc84e1d3d8955a3061c4f86b1655c8ffb34839b4f48691113884e4f7' 
  AND token = 'rEEchdgM3ftZdG0nUJH/XhTtMjIHjDYobTJSrdQH11U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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